File-milling head



E.' A. ANHEusr-:R

.FILE MILLING HEAD Filed Jan. 6. 1927 INVENTR.-

lToRNEY.

ROT/9770 Ha'. .'5.v

liatente'd Apr. 23, 1929*;

PATENT OFFICE.

f ERNEST A.. ANHEUSER, 0F MILWAUKEE, WISCONSIN.

FuE-MILLING HEAD.

Application filed January 6, 1927. Serial No. 159,305.

This invention relates to rasps and iles, and the cutting of steel blanks that, after hardening, form those implements used as abrasive elements on metals or other substances requiring a certain finish performed with tools of this class.

The objects 'of the invention provide -a preferred. abrasive, or .scored surface that forms the tooth consideration of files and the like. rlhe obtaining of a convex surface coincident with the cutting of the scores or teeth. The eliminating of a consequent treatment of the milled bars whereby a sandblasting application irregularly lessens an unavoidable concavity left in the toothed surfaces of files after cutting same by i methods heretofore common. The minimizing of the work of cutting tools that score the blanks prior to heat-treating and coincidently increasing the production of iinished product. The providing of a reciproeating assembly which permits of a departure in the inclined relation between the forming mechanism andthe blank; and the provision whereby Aa cutting path is maintained along the are of a limited circle with. out disturbing the blanks surface at the opposite arcs path notwithstandingthe condition wherein both arcs are bisected by the said blanks longitudinally medial line.

Other objects will be seen in the drawing,

described in the specification, and pointed out in the appended claims, all of which form part of this application.

Referring to the drawing: Fig. l is a sectional elevation taken on line 1-1 of Fig. 2. j

. Fig. 2 isa plan view taken on line 2-2 of p Fig. 1. Fig. 3 is a development diagram of the cutting cycle. i j

Fig. 4 is an enlarged fragmentary detail of a cut blank.

Fig. 5 is a section on line 5-5 of Fig. 4. Similar characters of reference apply to like parts throughout the several views. The

said views are intentionally simplified and somewhat diagrammatic in omitting the ac- `'tual structuralv machine conditions, which Amay be varied in design for acquiring a` working and economically produced-assembly. `The improvement is intended as lan adjunct attachable'to any standard make of milling-machine, or drill-press, .where is present the necessary rotative action accompanied lwith the power common to machines Aof this class. The devi-ce may also be opuct being later subjected to a heat-treating process that leaves same a hardened element not easily affected by other than a grinding process, which includes where same is req'- uisite for cleaning, the commonly adapted sand-blast operation, for polishing and elimmating any unevenness resulting from either the'` cutting or the hardening stages of manufacture.

Referring to the drawings, and particularly the Figs. l and 2, the improvement is shown as adapted to existing machines having a table l, here made adjustable for raising and lowering through means of a screw 2 that is threaded to coincide with a nut-like enlargement 3 of a machine frame-work. The blank B, of steel-strap stock,l is fed across the table in intermittent steps thaty occur in synchronism with a selected period of the machines rotating shaft S. This inical assembly beyond the present considera- I tion.

A supporting unit 4 is suitably arranged to span ythe table 1 and the blank'B through yhaving its base recessed at R for allowing the said table to be adjusted independently of the unit aforesaid, and to also permit the assage therethrough of the intermittently advanced ribbon of stock, which is in a measure, a continuously cut blank that is afterwards severed into specified lengths that vform the intended tools.4 A. rotary head H is formed of segmental blocks 6 which are grouped. to arrange themselves about the end of the vertical shaft S. Each cally and all rotate with the shaft S by virture Aof being splined, or keyed to the .aforesaid shaft as indicated by S. The

in a horizontally arranged -annular cam .segment 6 is independently slidable vertitrack 8 formed in thesupporting unit 4.

The several segments 6 are 'machined to function'as chucks that receive a compliment of cutting bits 49 whoseeifective pomts 9l project below the bottom faces of their respectivey segment. The cutting field of the points 9 are confined to a fixed horizontal plane, and their effect upon the workedstock is determined by the adjustable means 1, 2 and 3 mentioned above. The assembled fr head H oii'ers a plunger-like element that is tudinal center-line of the aforesaid blank,

as lshown in llig. 4. rlllae formationl of arcuate edges on, the blank is performed at the feed end, in this instance, `because of the shafts revolutionary direction, and, in order to allow this,'the remaining segments 6, not in this cutting zone, must be raised up, or, in process of bemg raised, so that the opposite circular zone, traversed by the blank, will be open and free of the cutting bits whose points would otherwise ruin the work already performed. 'lln order to provide this condition, 'the cam-track 8 is contoured to present its lowest position, Yat the cutting zone (a) fronr'which Zone it raises and again lowers to leave the said track at its highest elevation over the opposite zone (b). The inclination of the cam-track 8 is determined to besuch that the worked stock is only affected at the zone (a). 'llhis elevating of the se ents 6 oers a certain space between the blank and theelevated cutters and this said space is `utilized to permit the table of being noticeably inclined as shown. 'llhis inclination provides a cutting path for the points 9 that is convex'` over the blank B instead of concave as is the case in tools cut by heretofore employed processes. rEhe concave result is objectionable, and the product of this concave method of cutting teeth, must be subjected toan unreliable and irregular operation for remedying this defect, wherein sand-blasting is employed in an endeavor to 4level the edge-adjacent areas down to an approximation of the center; of a out blank. rlhis oii'ers a very indefinite result in a condition where 2 or 3 thousandths are noticeable volumes in the work upon which these tools, or files are used, such as :v

auto-bodies, sheet-metal fixtures, containers, etc., where the slightest departure from a smooth surface becomes magnified when the finishing polish -is applied. I

The cutters 9 are arranged in step-like order so that one revolution of the head H will out a complete, tooth. The-blank is automatically advanced across the inclinedly lfixed, but vertically adjustable table 1 as per feathered. arrow, in definite steps that are equivalent to the pitch of the arcuately parallel teeth, and, on this account,Vv

a gap is left in the cutting circle by leaving out bits to permit the blank to be intermittently forwarded across the said table. The blank may also be reversed and worked similarly to provide a double edge tool if desired; this is indicated in Figs. 4 and 5.

The views are purposely diagrammatic in the sense of assembling the parts; however, this phase has been cared for; and the separate portions, not particularly defined fer a plurality of segments independent of each other and independently reciprocative in operation for approaching or receding lfrom the aforesaid table.

2. A. rotary milling head having, circu- I larly arranged bits grouped in segmentary sets in `oper'atively reciprocative segments ofl said head, said sets containing a graduated complement of bits that project below the bottom face of the aforesaid segments to partially cut arcuately formed teeth in a blank disposed upon a support, said support being upwardly inclined from the feed end. 3. A rotary milling head having, a stationary unit, cutting bits, bit holding quadrants, a revolving shaft, said bits arranged about the vertically revolving shaft, each quadrant slidably keyed tothe shaft afore-v saidfor indepedent reciprocative action upon the shaft' aforesaid. 4:.' A rotary'milling head having, a central revolving shaft, a cutter head, said shaft slotted to permit the cutter head assembly comprising segmentary quadrants to reciprocate thereon while horizontally rotating as a unit. 5. A rotary milling devicehaving, a revolving head assembly provided with cutting bits, a stationary unit bored to envelope the said assembly, projections on said assemblys periphery, an annular cam track around the units bore to receive the several projections aforesaid, the contour of the cam ,track being varied continuously to oder one uportion disposed in a horizontal plane that lies-beneath the plane of the remainder of said track. Y

6. A rotary milling head having, a rota'- tive assembly, a sleeve member for center'- ing the plurality of quadrants forming said rotative assembly, an adjustable table horizontally inclined and symmetrically aligned with and below said member, and means to allow'vertical adjustment of the table aforesaid.

l7.'A rotary milling head comprising, a stationary unit, a rotative shaft, segmentary quadrants carrying cutting bits assembled about and reciprocative uponv said shaft, an annular cam path fashioned in the unit aforesaid, projections integral with the several quadrants extending into said path, said path designed to offer a contour that induces the reciprocative action in the rotating segmentary quadrants aforesaid.

8. A rotary milling device having, a rotaneath said unit, a recess formed across the base of said unit wherein the aforesaid table may approach or recede from the aforesaid rotative assembly.

In testimony of which I hereto aiiix my i signature.

x ERNEST A. ANHEUSER. 

